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The 16 Relay I/O Card relay output board occupies a total of two consecutive I/O
locations. A DIP switch is used to set the base address for these locations. Be careful
when selecting the base address, as some selections conflict with existing PC ports.
Table 3-1 shows several examples that usually do not cause a conflict.
Address
282–283
10 1000 001x
286–287
10 1000 011x
38A–38B
11 1000 101x
3A2–3A3
11 1010 001x
3A6–3A7
11 1010 011x
302–303
11 0000 001x
306–307
11 0000 011x
2EA–2EB
10 1110 101x
2EE–2EF
10 1110 111x
322–323
11 0010 001x
Table 3-2 shows the correlation between the DIP-switch setting and the address bits
used to determine the base address. Assume 302 Hex to 303 Hex is the desired
base address. 302 Hex = 1100 00XX in binary.
Switch Position
1
2
3
4
5
6
7
8
3. Address Selection
Table 3-1. Valid base addresses.
Binary
1
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Address line A1 is always a "1."
Table 3-2. Determining the base address.
Address Line
A9
A8
A7
A6
A5
A4
A3
A2
CHAPTER 3: Address Selection
Switch Settings
2
3
4
On
Off
On
On
Off
On
Off
Off
On
Off
Off
On
Off
Off
On
Off
On
On
Off
On
On
On
Off
Off
On
Off
Off
Off
On
On
NOTE
Binary
1
1
0
0
0
0
0
0
5
6
7
On
On
On
Off
On
On
On
On
Off
Off
On
On
Off
On
On
On
On
On
On
On
On
Off
On
Off
Off
On
Off
Off
On
On
Switch Setting
OFF
OFF
ON
ON
ON
ON
ON
ON
8
On
Off
On
On
Off
On
Off
On
Off
On
11
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